Fuse-attachment plug.



O. CARSON.

FUSE ATTACHMENT PLUG.

APPLICATION FILED 0015,1910.

1,043,802, Y Patented Nov. 12. 1912.

\ Svwcnfoz C la'rm (20 Carson i the attachment plug.

tween the contact terminals 1 and 2 and the the casing shown in section.

UNITED STATES PATENT OFFICE.

CLARENCE CARSON. OF DAYTON, OHIO, ASSIGNOR TO THE'N'ATIQNAL CASH REGISTER COMPANY, OF DAYTON, OHIO. A GORPQRATION OF OHIO (INCORPORATED IN 1906.)

FUSE-ATTACHMENT PLlIIG.

v Specification of Letters Patent,

Patented Nov. 12, 1912.

Applicationfiled October 5, 191 Serial No. 585,373.

to all whom it may concern:

Be it known that I, CLnRnNen CAnson, a citizen of the United States residing at Dayton, in the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in Fusi-Attachmeat Plugs, of which I declare the followingto be a full. clear and exact description.

This invention relates to attachment plugs tor making electrical connections and the principal ()bjEECt is to provide a swiveled attachment whereby the plug may be attached to a lamp socket without twisting the connecting wires.

Another object of the invention is to provide a swivel. attacln'nent for the attachmentplug wherel'iy the same may be easily at tachcd or detached trom the plug.

- Another object of this invention is to provide fuses carried by the plug so that the fuses may readily be detached in case of their being burned out. I

With these and incidental objects in view, the invention consists in certain novel features at construction and combinations of parts, the essential elements of which are set forth in appended claim, and a preferred form oi embodiment of which is hereinafter described with reference to the drawings which accompany and form part of the specification.

Figure l is a side elevation partly in sec tion at the improved attachment plug with the casing for same shown in dotted lines. Fig. is a view somewhat similar but looking in the opposite direction with Fig. 3 is a section taken on line 3%; ol. Fig. 1 and. looking in. the direction of the arrow. Fig. dis a section taken onlinc 4-4: of Fig. 1 and looking in. the direction of the arrow. Fig. 5 is a perspective view of the contact strip haw ing the spring fingers for preventing the removal of one of the contact terminals from the plum swivcled contact terminal.

The contact terminals 1 and? are mounted upon an insulating plug 3 substantially inclosed in a casing 4, and these terminals 1 and 2 are connected to fuses 5 and 6 respectively which .tuses are connected to wires 7 and 8 inclosed in a. cable 9 leading from The connections hefuses 5 and (Sand also the connect-ions'bethe surface of the circular the portion 15 of the block 3.

Fig. (i is-a. side elevation of the.

nut 23. The inner endgif the wire '2 between the nut 23 and a tween the fuses and the wires 7 and 8 will hereinafter be more specifically described.

The contact terminal 1 (see l. L and (5) formed of a screw threaded brass sleeve 10. the inner end of which is attached to an insulating ring 11. The sleeve 10 near its inner end is provided with annular rib 12 into which the ends of the spring lingers 13 project, these fingers extend from a brass .ollar 1athat surrounds the inner end of a reduced portion iii of the insulating block 3, as shown in Fig. 2. The fingers l3 EX- tend in grooves. formed in the side. of the reduced portion 15. as shown in. Figs. 2 and 4, and are bent bachwardly so that the outer edge of thc Spl'illfl fingers 13 are tlush with portion of the reduced part 15 of the insulating block 3. The extreme ends of these fingers 13 are bent outn 'ardly so that when the contact terminal 1 is slipped over the reduced portion 1.5 of the block 3 the ends of the spring fingers 13 will engage with the annular rib 12 and hold said contact terminal in positioirupon The collar H" is split, as shown in Ft 5. so that said collar may be properly positioned upon the reduced portion 15 of the block 3. From this it will be seen that the contact terminal 1 after being attached may be rotated by the insulating ring it) so that the same may be screwed into lamp socket (not. shown) as is well, known in the art hut cannot be detached flfilll the [JOIUOH 1' H16. ll l 111011113 l el ell l' i0 1 1 after descriliied. The lingers 13 are constantly in engagement with the inside of the sleeve .0 ot the contact terminal 1 and the t exte 'iding therefrom (see i l and 5) a brass strip 16 the free end of which is held by a nut 17 which is attached to a conducting screw 18, the head of which holds a collar 1 lcarrvin the )rin lii'i 'err'e 135 has :s t a Pring clil) 19 against a rib 20 oi. thc-insu lating block 3. Spring clip '15 supports one end of the fuse 5 while the other end of said fuse is supported by a clip 2 similar to theclip l9 and which is held upon the rib 539 of the block 3 by a conducting screw 22, the outer endot' which has attached. thereto 9.

passes hrass plate 2% surrounding the screw 22. From this it will be seen that the, connections as (fie-scribed form one side of a line from the wire? to the contact terminal 1, and the connections be tween the terminal 2 and the wire 8 forming the other side of the line will now be described. 5

Referring to Fig. 9 it will be seen that the contact terminal 2 has extending therethrough a screw 25 which passes through the reducedportion of the block 8 and has secured to its inner end nut 28 which passes through an opening 27 in the reduced portion 15 and thereby securely hold the contact terminal and screw in their proper posit-ions. One end of a connecting strip 528 in the form of a wire is passed around the shank of the screw and between the inside :tace of the contact terminal 2 and a brass plate 29 and is securely held in position by the screw The wire 28 passes through a suitable opening in the portion 15 of the block 3 and the other end. of this wire 28 is held in position by a nut 30 which passes around the free end. of a screw 31, the head of said screw passing through a clip 82 securely to hold said clip in place upon a rib 33 projecting from the insulating block This spring clip 32 supports one end of the fuse 6 while the other end of the fuse is supported by a similar clip 3a which is held in place upon the rib 33 by a screw 35. the outer end of said screw having nut 36 thereon which holds the inner end of the wire 8 securely in place between said nut 36 and a hrass plate 37 which surrounds the screw 35.

The end of the insulating block 3 opposite from the end carrying the reduced portion-L 15 is rounded and is internally screw thread ed. An externally threaded bushing 38 is screwed into the roiimded end of the insulating hlocl: 3 and is provided with an enlarged knurled head 39 by which it is rotated when attaching or detaching it to the insulating hlocl; 3. The casing at is U shaped in longitudinal. section as seen in Figs. 1 and 2 and is provided with a l. rge opening at one end and a smaller opening at the other end.

The casing 4- is held in position surrounding the block 3 by the edge of the smaller opening of said casing being securely held hetwecn the rounded end of the insulating block 3 and the inner side of the enlarged head 39 of the bushing 38, as fully shown in Fig 9 This casing may-be made of any I suitable material and it it he of conducting material, a suitable strip of insulating material 40 covers the inside surface of the easing. The bushing 38 may be formed of any suitable insulating material. V

As shown in Figs. 1 2 and G, the sleeve 10 of the contactterminal 1 is provided with recesses upon diametrically opposite sides thereof. These. recesses are to permit the depressing of the spring fingers 13, by insertion of suitable tools so that the contact terminal 1 may he removed from the portion 15 of the block 3.

From the above description it will readily be seen that it the contact terminals 1 and 2 become defective they may be easily removed without removing any of the other parts of the attachment plug and also by mounting the -t'uses upon the attachment plug the fuses may be easily removed by unscrewing the bushing and moving the easing at along the cable 9 until the fuses are accessible.

While the form 01. mechanism shown herewith and described is admirably adapted to fulfil the objects primarily stated, it to he understood that it is not intended to confine the invention to the one form of embodiment herein shown and describeth it susceptible of embodiment in various forms all coming within the scope of the claim which follows.

Claim:

An attachment plug haying contact terminals, one of said terminals being ring shaped and rotatably mounted upon the plug, fus s also mounted upon the plug, and contact strips connecting the terminals and. the T. one of said strips having spring fingers for preventing the removal of the rotatable contact terminal from the lug but permittin the rotation of same thereon, said rotata e contact terminal. haying rec to permit the operation of the sprim to allow the removal of the said lerminal.

In testimony whereof I allix my signature in the presence of two witnesses.

CLARENCE (Jansen.

Witnesses it. (,3. Grass, CARL W. Enn- 

